2 White spot
[Symptom]
White spot appears on the image.
Spot with core Spot without core
A: When symptom occurs only for single color, see probable cause A.
B: If the symptom is solved when changing the paper type to the recommended paper, see
probable cause B.
[Probable causes and solutions]
A: If the spot has core, white spot appears due to the increase of the inside machine
temperature according to the high room temperature or other factor. By the temperature
increase, toner forms core in the developer and the poor transfer (1
st
transfer/2
nd
transfer)
occurs around the core, causing the white spots.
If the spot does not have core, the cause is the high charge developer by the many prints
of the low coverage original etc. When the charge amount of the developer increases,
the transfer ability decreases at the part, causing white spots.
To correct the above, perform toner refresh mode:
Utility menu => [03 Machine Admin. Setting] => [01 System Setting] => [05 Expert
Adjustment] => [08 Execute Adjust Operation] => [Toner refresh mode]
If it does not improve, after checking the following setting, perform the toner refresh mode
again.
Service mode => [02 Process adjustment] => [05 Interval/Quantity adjustment] => [03
Auto refresh interval] => [Refresh quantity] => Select from [small], [middle], [large]
Refresh amount
Toner consumption per one
refresh operation
Max number for refresh
mode execution
Small
A3 solid, 3 sheets equivalent
3 times
Middle
A3 solid, 5 sheets equivalent
Twice
Large
A3 solid, 8 sheets equivalent
(8050 equivalent)
Once
If toner refresh is performed excessively, not only too much toner is consumed but may
cause cleaning failure of the transfer belt (passing through, packing). Therefore, keep the
above max number when performing the refresh mode.
B: If the used paper and the set current for the 1
st
transfer and the 2
nd
transfer do not match,
transfer ability becomes poor and tends to generates white spots. To correct the above,
perform 1
st
transfer manual adjustment and 2
nd
transfer manual adjustment. For the
adjustment procedure, see
13 Problem with non-recommended paper
.
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